1 files changed, 57 insertions, 0 deletions

diff --git a/modules/prometheus-lvm-exporter.nix b/modules/prometheus-lvm-exporter.nix
new file mode 100644
index 00000000..f0951d46
--- /dev/null
+++ b/modules/prometheus-lvm-exporter.nix
@@ -0,0 +1,57 @@
+{ lib, config, pkgs, utils, ... }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.lvm;
+in {
+  options = {
+    services.prometheus.exporters.lvm = {
+      enable = mkEnableOption "Prometheus LVM exporter";
+
+      listenAddress = mkOption {
+        type = types.str;
+        default = "localhost";
+      };
+      port = mkOption {
+        type = types.port;
+        default = 9845;
+      };
+
+      openFirewall = mkOption {
+        type = types.bool;
+        default = false;
+        description = lib.mdDoc ''
+          Open port in firewall for incoming connections.
+        '';
+      };
+      firewallFilter = mkOption {
+        type = types.nullOr types.str;
+        default = null;
+        example = literalExpression ''
+          "-i eth0 -p tcp -m tcp --dport ${toString cfg.port}"
+        '';
+        description = lib.mdDoc ''
+          Specify a filter for iptables to use when
+          {option}`services.prometheus.exporters.lvm.openFirewall`
+          is true. It is used as `ip46tables -I nixos-fw firewallFilter -j nixos-fw-accept`.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services."prometheus-lvm-exporter" = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" ];
+
+      serviceConfig = {
+        ExecStart = "${pkgs.prometheus-lvm-exporter}/bin/prometheus-lvm-exporter ${utils.escapeSystemdExecArgs [
+          "-web.listen-address" "${cfg.listenAddress}:${toString cfg.port}"
+        ]}";
+
+        Restart = "always";
+      };
+    };
+  };
+}